Dampening device of a printing machine



Oct. 25, 1966 J JURN? 3,280,733

DAMPENING DEVICE OF A PRINTING MACHINE Filed Nov. 4, 1964 2 Sheets-Sheet1 1N VENTO Oct. 25, J. JURN? DAMPENING DEVICE OF A PRINTING MACHINEFiled Nov. 4, 1964 2 Sheets-Sheet 2 INVENTOR.

7546/ Tum BY United States Patent 3,280,733 DAMPENING DEVICE OF APRINTING MACHINE Josef Jul-n3", Sebranice u Kunstatu, Czechoslovakia,assignor to Adamovsk strojirny, narodni podnik, Adamov, CzechoslovakiaFiled Nov. 4, 1964, Ser. No. 408,852 2 Claims. (Cl. 101147) Theinvention relates to a device for damping the printing plate of offsetprinting machines.

The damping device of offset printing machines must satisfy therequirements of perfect damping of the printing plate, of easy operationand exchange of the damping rollers. The latter requirement is ofparticular importance in the case of printing machines for smalldimensional print because in this case the printed editions arerelatively low so that the damping roller must he often exchanged.

In damping devices of offset printing machines in accordance with theknown state of art the damping rollers and the distributing rollers aremounted in holders which permit their adjustment into pressure contactwith the printing form and the distributing roller. The damping rollersin a clamping device of this type are stably mounted directly in theside pieces of the machine. It is therefore very diflicult to remove thedamping rollers from the machine and it is often necessary to removealso the feed roller or ductor, or the wading roller to permit access tothe damping rollers. If printing is interrupted, the damping rollers areremoved from the printing plate -by means of mechanisms which cause aswinging movement of arms in which the damping rollers are mounted.

It is a general object of this invention to eliminate the mentioneddrawbacks of the known state of the art.

Stated briefly but more specifically, the invention relates to thedamping device of a printing machine, the characteristic feature ofwhich resides in the fact that in a pair of side pieces with a removablymounted bottom damping roller there is pivoted a pair of holders inwhich is removably mounted a top damping roller and where the pivotedpair of side pieces is mounted on the shaft of a toothed wheel, the pairof holders being pivoted on the shaft of a rubbing-down roller.

The invention will be best understood from the following specificationto be read in conjunction with the accompanying drawings in which isillustrated a preferred example of embodiment.

In the drawings:

FIG. 1 illustrates a partial elevation of the device;

FIG. 2 is a side elevation of the device in the working position, thatis in the position where the damping rollers are in pressure contactwith the printing plate and the distributing roller;

FIG. 3 illustrates a side elevation of the device where the dampingrollers are removed from the printing plate; and

FIG. 4 illustrates a side elevation of the device in the case ofcomplete tilting.

Referring now more particularly to the accompanying figures, it is seenthat the device consists of separate side pieces 2 mounted on a shaft 1which is pivoted in side pieces 21 of the printing machine. In theseparate side pieces is mounted the bottom damping roller 4 whosebearings 12 are set into grooves of the said side pieces 2.

In the said side pieces 2 is also pivoted the distributing roller 7 andholders 3 in the grooves of which is mounted by means of bearings 18 atop damping roller 5. To the side portions 2 and holders 3 are attachedpins 19 on which is held a spring 20. The holders 3 are provided withadjustable screws 10 which rest against stops 11 held in the side pieces2. On end of a spring 17 which is slipped over the shaft 1 is attachedto side pieces 21 of the machine and its other end is attached to sidepiece 2. To the shaft 1 is attached a lever 15 which rests against a setscrew 14 passing through the holder 13 held in side pieces 21 of theprinting machine. A manual lever 16 is attached to lever 15. The toothedwheel 9 which is attached to distributing roller 7 engages with toothedwheel 8 which is pivoted on shaft 1. Toothed wheel 8 engages withtoothed wheel 6 attached to the shaft of printing roller 22.

The device in accordance with the invention operates in the followingmanner: On interruption of printing, a nonillustrated manual, mechanicalor automatic device tilts away side pieces 2 with the damping rollers 4,5 and the distributing roller 7, in such a manner that the dampingrollers 4, 5 are not in contact with the printing form attached to theprinting roller 22. If the damping rollers 4, 5 are to be exchanged, theside pieces 2 with all their accessories are tilted down into thehorizontal position. In this position they are arrested by means of anonillustrated device so that the damping roller can be readily removedand replaced or exchanged without first requiring removal of otherrollers. This tilting operation can be carried out without interruptingthe drive because the inter-posed toothed wheel 8 which transmits themovement from the printing roller 22 to the distributing roller 7 ispivoted directly on shaft 1 which is rotated to accomplish tilting. Thedamping rollers 4, 5 can be readily adjusted to the necessary pressurecontact with the printing roller 22 and the distributing roller 7. Thisadjustment is accomplished for the bottom damping roller 4 by adjustinga set screw 14 which acts as an adjustable stop against rotationproduced by spring 17 which produces the necessary pressure. The topdamping roller 5 is adjusted by means of set screws 10 which producedrotation of holder 3. Further pressure against stop 11 is achieved bymeans of spring 20. By this movement the top damping roller 5 is pressedbetween the printing roller 22 and the distributing roller 7. Due to thefact that the bearings 18 of the top damping roller 5 are freely movablein the grooves of holders 3, the upper damping roller is readilyadjusted to the necessary pressure.

It can be seen from the above that the advantages of the device inaccordance with the invention reside in the following facts: This simpledevice in accordance with the invention permits by mere rotation of theshaft to which are attached to the side pieces of the damping rollers toremove the damping rollers from the printing plate. Rotation or tiltingof the damping device into the horizontal position facilitates largelyremoval of the damping rollers because they are now easily accessibleand the other rollers of the damping device need not be removed.Adjustment of the damping rollers to the necessary pressure with theprinting plate and the distribution roller is also easy and isaccomplished by mere turning of the side pieces in which the dampingrollers are mounted.

What I claim is:

1. In a printing machine, a damping device comprising:

a pair of tilt-able side pieces;

a bottom damping roller removably mounted in said pair of tilta ble sidepieces;

3 4% a pair of holders pivoted in said pair of tiltable side the saidpair of tiltable side pieces and holders are propieces; vided with setscrews. 2. top damping roller remova-bly mounted in said pair of pivotedholders; References Cited by the Examiner a shaft carrying rotarydriving means and the said pair 5 UNITED STATES PATENTS 0f tiltable Sidep 1,535,567 4/1925 Bornschein 101 14s a rubbing-down roller with a shaftpivoted in said pair 3,0 4, 2 4 19 3 stobb 1Q1 147 X of tiltable sidepieces; 3,230,877 1/1966 Birk 101351 the said pair of holders beingpivoted on the said shaft f the said rubbingdown rollen 10 ROBERT E.PULFREY, Primary Examiner.

2. A damping device as claimed in claim 1, wherein H, P, EWELL,Assistant Examiner.

1. IN A PRINTING MACHINE, A DAMPING DEVICE COMPRISING: A PAIR OFTILTABLE SIDE PIECES; A BOTTOM DAMPING ROLLER REMOVABLY MOUNTED IN SAIDPAIR OF TILTABLE SIDE PIECES; A PAIR OF HOLDERS PIVOTED IN SAID PAIR OFTILTABLE SIDE PIECES; A TOP DAMPING ROLLER REMOVABLY MOUNTED IN SAIDPAIR OF PIVOTED HOLDERS; A SHAFT CARRYING ROTARY DRIVING MEANS AND THESAID PAIR OF TILTABLE SIDE PIECES; A RUBBING-DOWN ROLLER WITH A SHAFTPIVOTED IN SAID PAIR OF TILTABLE SIDE PIECES; THE SAID PAIR OF HOLDERSBEING PIVOTED ON THE SAID SHAFT OF THE SAID RUBBING-DOWN ROLLER.